Global Plankton Database: inventory and data for cruise ML30@en

Mesozooplankton was sampled by open-closing JUDAY net with a 36 cm ring diameter and mesh size of 125 µm. Additionally, the JUDAY oceanic model JOM with 300 µm mesh size and 80 cm ring diameter was used. The open-closing mechanism used was the Nansen mechanical lock system allowing nets to be vertically towed through standard depths (0-10, 10-25, 25-50, 50-100, 100-200, 200-300, 300-500 m) and closed at the upper depth level. Depth of tow was evaluated by wire paid out and the angle of wire inclination. The 10-20 ml samples were preserved in 3-4% buffered formaldehyde and processed on return to the laboratory. All of copepods were identified to genus level, other taxanomic groups - to type, class, order and family levels.本研究采用环径36 cm、网目尺寸125 µm的开闭式JUDAY网（open-closing JUDAY net）采集中型浮游动物（Mesozooplankton）样本。此外，还使用了网目尺寸300 µm、环径80 cm的JUDAY海洋模式JOM（JUDAY oceanic model JOM）。该采样装置采用南森机械锁定系统（Nansen mechanical lock system）作为开闭机制，可使网具沿垂直方向在标准水层（0-10 m、10-25 m、25-50 m、50-100 m、100-200 m、200-300 m、300-500 m）中拖曳，并于上层水层处闭合。拖曳水深通过放出缆绳的长度及缆绳倾斜角度进行评估。采集得到的10-20 ml样本经3%-4%缓冲甲醛（buffered formaldehyde）固定保存，带回实验室后开展后续处理。所有桡足类（copepods）样本均被鉴定至属级分类水平，其余分类群则分别鉴定至型、纲、目及科级分类水平。